#include<bits/stdc++.h>
using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if((a+b)<c or (a+c)<b or (c+b)<a)
	{
		cout<<"No";
		return 0;
	}
	else if((a+b)>c and (a+c)>b and (c+b)>a )
		cout<<"Yes";
	else 
		cout<<"No";
	return 0;
}
//WSH ON TOP!!!
